From 9db5a1ec722076c7e516e98c302ee82157e7be7d Mon Sep 17 00:00:00 2001
From: Jan Grewe <jan@faked.org>
Date: Sat, 1 Mar 2014 20:14:09 +0100
Subject: [PATCH] add keep-alive
---
app.js | 48 +++++++++++++++++++++++++++++++-----------------
1 file changed, 31 insertions(+), 17 deletions(-)
diff --git a/app.js b/app.js
index 6656f92..ea96a8b 100644
--- a/app.js
+++ b/app.js
@@ -15,6 +15,8 @@ var http = require('http');
var path = require('path');
var net = require('net');
var dgram = require('dgram');
+var http = require('http');
+
var app = express();
@@ -44,35 +46,46 @@ http.createServer(app).listen(app.get('port'), function(){
findCard();
+function enableShootAndView() {
+
-function pingCard() {
+}
+
+function pingCard(ip) {
- var client = new net.Socket();
- client.connect(0, cardAddr, function() {
- client.write('ping');
+ req = http.get('http://'+ip+'/', function(res) {
+ console.log('Card is alive!');
+ req.destroy();
});
- client.setTimeout(5000, function(data) {
- console.log('TIMEOUT');
+ req.on('error', function(err) {
+ cardFound = false;
+ //console.log('ERROR: ' + err);
+ req.destroy();
clearInterval(itvPing);
+ findCard();
});
- client.on('error', function(err) {
- console.log('ERRROR: ' + err);
+ req.setTimeout(5000, function(data) {
+ cardFound = false;
+ console.log('Card has disappeared!');
+ req.destroy();
clearInterval(itvPing);
- client.destroy();
- });
-
- client.on('data', function(data) {
- console.log('DATA: ' + data);
- client.destroy();
+ findCard();
});
}
+var alreadySearching = false;
+
function findCard() {
+ if(alreadySearching == true)
+ return;
+ else
+ alreadySearching = true;
+
var socket = dgram.createSocket('udp4');
var message = new Buffer('dummy');
var itvSearch;
@@ -87,25 +100,25 @@ function findCard() {
});
socket.on('message', function (msg, rinfo) {
- //console.log("socket got: " + msg + " from " + rinfo.address + ":" + rinfo.port);
clearInterval(itvSearch);
socket.close();
msg = msg.toString();
cardAddr = msg.match(/ip=(.*)/)[1];
cardFound = true;
itvPing = setInterval(function() {
- pingCard();
+ pingCard(cardAddr);
}, 5000);
console.log("Found card on "+cardAddr);
+ alreadySearching = false;
});
socket.on('listening', function () {
var address = socket.address();
- //console.log("WiPho server listening on " + address.address + ":" + address.port);
sendSearch();
itvSearch = setInterval(function() {
sendSearch();
}, 5000);
+
function sendSearch() {
console.log("Searching for card...");
socket.send(message, 0, message.length, 55777, cardAddr, function(err, bytes) {
@@ -113,6 +126,7 @@ function findCard() {
console.log("socket error:\n" + err.stack);
});
}
+
});
}
\ No newline at end of file
--
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